If you're looking for a specific topic with a relatively narrow focus, question and answer search engines might just be what you're looking for. These search engines aggregate the vast resources of the Web into strictly defined categories; in other words, they make it extremely easy to find something.
BrainBoost is an automated question-answering search engine. Here's how it works: you type in a question, any question, and instead of merely matching your search query in page text and titles like other search engines, BrainBoost actually goes the next logical step and sorts through the search results for you, then extracts the answer to your question.
is an innovative way to find answers on the Web, without searching for them. Instead of going to your favorite search engine and typing in a query, then sorting through various links to find the answer that you are looking for, Answers.com "displays quick, snapshot answers with concise, reliable information." Answers.com's tagline seems to sum this up: "the world's greatest encyclodictionalmanacapedia."
Factbites, according to the home page, is an encyclopedia crossed with a search engine. Factbites endeavors to pull facts from web pages or online encyclopedias and presents them in your search results.